const UNICODE_MATCH_REG = /[^\x00-\xff]/g
const CONTENT_MATCH_REG = /(?<!-)content\s*:\s*([^;\}]+)/g
module.exports = function(source) {
  source = source.replace(CONTENT_MATCH_REG, function(m, p1) {
    return m.replace(UNICODE_MATCH_REG, function(m) {
      return '\\' + m.charCodeAt(0).toString(16)
    })
  })
  return source
}
